The wastewater treatment plants have existed for a long time. The chief purpose of these wastewater plants is to treat loads of liquid and solid waste that gets generated from industries, houses and other places. The clarifiers in these treatment plants have always been an essential part from the starting only. A clarifier in general is extensively used in removing the suspended solids or solid particulates from the liquids for clarification purposes. 

The method of sedimentation is a vital part of any wastewater treatment. Here the contaminants settle down because of gravity. Thus the clean liquid gets separated. A similar concept of gravity settling is used by the clarifiers to eliminate solid particulates from water. The concentrated impurities are better called the “Sludge”. The particles floating on the liquid’s surface are known as scum. Some poly-electrolyte and coagulants can be used for boosting the performance of this “natural settling” of solids by transforming them into “Floc”.

What is a clarification Process?

The clarification process contains the elimination of different types of particles, oil, sediments, and natural organic matters from the water. It makes the water much cleaner. This clarification step is the main and foremost part of any kind of treatment for either surface water treatment or wastewater treatment. It contains:

  1. a) The Screening Process
  2. b) Coagulation-Flocculation (A physical or chemical treatment)
  3. c) Sedimentation or Flotation 
  4. d) Fine filtration

Applications of Clarifiers:

The clarifiers are used in various applications like:

  1. a) Pretreatment
  2. b) Portable water treatment
  3. c) Wastewater treatment

Kinds of Clarifier:

There are various clarifier designs available in the market used for wastewater treatment plants. It varies depending on several applications and usages. It may range from:

  1. a) Primary Clarifier
  2. b) Secondary Clarifier
  3. c) circular Clarifier
  4. d) rectangular Clarifier
  5. f) lamella Clarifier
  6. g) solid Contacts Clarifier

All the above-mentioned clarifier design variations may be available for you. choose them according to your space, system, and flow dictates.

Primary and Secondary Clarifiers:

A wastewater treatment plant demands 2 stages. First is the primary and second is secondary. 

The primary classifiers separate “settle-able” solids from raw incoming wastewater. These solids are situated in the wastewater plant’s downstream. The main function of this primary classifier is the elimination of all kinds of “settle-able” along with floating solid wastes. It has a lofty oxygen demand. – BOD. 

Secondary Clarifiers Are situated in the vicinity of biological treatment facilities. Here, these clarifiers eliminate treated wastewater from the primary treatment phase. The vital task of this secondary clarifier is – Clarification and concentrating. 

The performance of any wastewater treatment plant totally depends on the working of both Primary and secondary clarifiers. The importance of a clarifier tank in wastewater treatment is huge.

Some other Clarifiers:

The circular clarifiers may come in various forms like a spiral scraper, segmented rakes along hydraulic removal tapes. Choosing is totally based on treatment and the application goals. The rectangular chain and the scraper system can be available in 3 or 4 shaft configurations. The ballasted clarification with rectangular or circular clarifiers enhances the treatment capacity. It helps in meeting the “ENR limits”. It also produces effluent quality better than the conventional alternatives at an affordable life-cycle cost.

The applications of Clarifiers are mentioned below:

  1. a) Raw water Clarification 
  2. b) Primary Effluent Clarification
  3. c) Secondary Effluent Clarification
  4. d) Lime soda softening
  5. e) Sludge Thickener


Influence of Microorganisms on the secondary Clarifier Performance:


The secondary treatment of wastewater management is called biological treatment as living microorganisms are utilized herein breaking down the organic waste along with nutrients. It cleanses the polluted wastewater. It is very important in treating wastewater from misusing the environment, affecting the health of humans and even “eutrophication” of water. The microorganisms are specially grown in huge quantities for aerobic, anaerobic along with anoxic methods.

The secondary clarifier in wastewater treatment also helps in handling the mixed liquor suspended solid particles known as “MLSS”. These are found in huge amounts in the activated sludge methods. It puts a burden on these secondary clarifiers. With huge amounts of waste reaching the wastewater treatment plant and even the biological treatment solutions – the secondary clarifier may underperform. It may lead to the malfunction of the wastewater system. 

We should remember that clarifiers are a very vital component of any wastewater treatment plan. In every way, it performs the main activity of eliminating biomass produced in the secondary treatment process. It is extremely important to treat all the organic wastes with good solutions. This will make it hassle-free for the clarifiers to work at their best. There are several biological treatments solutions mainly designed to maximize the plants’ productivity. 

In conclusion, we will be elated to say that clarifiers are an extremely vital component for any wastewater management system. The removal of waste through clarifiers stands strong. Deploy the needed clarifier in your system to remove solid waste efficiently.


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